CVE-2026-28415Public exploitNetwork attack vector

Phishing redirects via unsanitized OAuth target URL

Published Feb 27, 2026 · Updated Feb 27, 2026

Open redirect in Gradio before 6.6.0 allows remote attackers to send users to arbitrary sites through crafted OAuth endpoint URLs. The _redirect_to_target() function passes the unvalidated _target_url query value directly to RedirectResponse, preserving an attacker-controlled scheme and host. OAuth must be enabled and a user must follow a crafted /logout or /login/callback link; the redirect supports phishing but does not expose server data.

CVSS severity4.3
Medium
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Open redirect in Gradio before 6.6.0 allows remote attackers to send users to arbitrary sites through crafted OAuth endpoint URLs. The _redirect_to_target() function passes the unvalidated _target_url query value directly to RedirectResponse, preserving an attacker-controlled scheme and host. OAuth must be enabled and a user must follow a crafted /logout or /login/callback link; the redirect supports phishing but does not expose server data.

The record

CVE
CVE-2026-28415
Published
Feb 27, 2026
Updated
Feb 27, 2026
Vendor
Gradio
Product
Gradio
Classifications
CWE-601, CWE-200, CWE-284, CWE-330, T1204.001, T1566.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 6.6.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Gradio · Gradioversion=< 6.6.0

Published CVSS scores

4.3GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-601URL Redirection to Untrusted Site ('Open Redirect')
CWE-200Exposure of Sensitive Information to an Unauthorized Actor
CWE-284Improper Access Control
CWE-330Use of Insufficiently Random Values
T1204.001Malicious Link
T1566.002Spearphishing Link

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo